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/******************************************************************************

 *

 * Module Name: dtexpress.c - Support for integer expressions and labels

 *

 *****************************************************************************/

/******************************************************************************

 *

 * 1. Copyright Notice

 *

 * Some or all of this work - Copyright (c) 1999 - 2011, Intel Corp.

 * All rights reserved.

 *

 * 2. License

 *

 * 2.1. This is your license from Intel Corp. under its intellectual property

 * rights.  You may have additional license terms from the party that provided

 * you this software, covering your right to use that party's intellectual

 * property rights.

 *

 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a

 * copy of the source code appearing in this file ("Covered Code") an

 * irrevocable, perpetual, worldwide license under Intel's copyrights in the

 * base code distributed originally by Intel ("Original Intel Code") to copy,

 * make derivatives, distribute, use and display any portion of the Covered

 * Code in any form, with the right to sublicense such rights; and

 *

 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent

 * license (with the right to sublicense), under only those claims of Intel

 * patents that are infringed by the Original Intel Code, to make, use, sell,

 * offer to sell, and import the Covered Code and derivative works thereof

 * solely to the minimum extent necessary to exercise the above copyright

 * license, and in no event shall the patent license extend to any additions

 * to or modifications of the Original Intel Code.  No other license or right

 * is granted directly or by implication, estoppel or otherwise;

 *

 * The above copyright and patent license is granted only if the following

 * conditions are met:

 *

 * 3. Conditions

 *

 * 3.1. Redistribution of Source with Rights to Further Distribute Source.

 * Redistribution of source code of any substantial portion of the Covered

 * Code or modification with rights to further distribute source must include

 * the above Copyright Notice, the above License, this list of Conditions,

 * and the following Disclaimer and Export Compliance provision.  In addition,

 * Licensee must cause all Covered Code to which Licensee contributes to

 * contain a file documenting the changes Licensee made to create that Covered

 * Code and the date of any change.  Licensee must include in that file the

 * documentation of any changes made by any predecessor Licensee.  Licensee

 * must include a prominent statement that the modification is derived,

 * directly or indirectly, from Original Intel Code.

 *

 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.

 * Redistribution of source code of any substantial portion of the Covered

 * Code or modification without rights to further distribute source must

 * include the following Disclaimer and Export Compliance provision in the

 * documentation and/or other materials provided with distribution.  In

 * addition, Licensee may not authorize further sublicense of source of any

 * portion of the Covered Code, and must include terms to the effect that the

 * license from Licensee to its licensee is limited to the intellectual

 * property embodied in the software Licensee provides to its licensee, and

 * not to intellectual property embodied in modifications its licensee may

 * make.

 *

 * 3.3. Redistribution of Executable. Redistribution in executable form of any

 * substantial portion of the Covered Code or modification must reproduce the

 * above Copyright Notice, and the following Disclaimer and Export Compliance

 * provision in the documentation and/or other materials provided with the

 * distribution.

 *

 * 3.4. Intel retains all right, title, and interest in and to the Original

 * Intel Code.

 *

 * 3.5. Neither the name Intel nor any other trademark owned or controlled by

 * Intel shall be used in advertising or otherwise to promote the sale, use or

 * other dealings in products derived from or relating to the Covered Code

 * without prior written authorization from Intel.

 *

 * 4. Disclaimer and Export Compliance

 *

 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED

 * HERE.  ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE

 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT,  ASSISTANCE,

 * INSTALLATION, TRAINING OR OTHER SERVICES.  INTEL WILL NOT PROVIDE ANY

 * UPDATES, ENHANCEMENTS OR EXTENSIONS.  INTEL SPECIFICALLY DISCLAIMS ANY

 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A

 * PARTICULAR PURPOSE.

 *

 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES

 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR

 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,

 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY

 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL

 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  THESE LIMITATIONS

 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY

 * LIMITED REMEDY.

 *

 * 4.3. Licensee shall not export, either directly or indirectly, any of this

 * software or system incorporating such software without first obtaining any

 * required license or other approval from the U. S. Department of Commerce or

 * any other agency or department of the United States Government.  In the

 * event Licensee exports any such software from the United States or

 * re-exports any such software from a foreign destination, Licensee shall

 * ensure that the distribution and export/re-export of the software is in

 * compliance with all laws, regulations, orders, or other restrictions of the

 * U.S. Export Administration Regulations. Licensee agrees that neither it nor

 * any of its subsidiaries will export/re-export any technical data, process,

 * software, or service, directly or indirectly, to any country for which the

 * United States government or any agency thereof requires an export license,

 * other governmental approval, or letter of assurance, without first obtaining

 * such license, approval or letter.

 *

 *****************************************************************************/

#define __DTEXPRESS_C__

#include "aslcompiler.h"

#include "dtcompiler.h"

#include "dtparser.y.h"

#define _COMPONENT          DT_COMPILER

        ACPI_MODULE_NAME    ("dtexpress")

/* Local prototypes */

static void

DtInsertLabelField (

    DT_FIELD                *Field);

static DT_FIELD *

DtLookupLabel (

    char                    *Name);

/* Global used for errors during parse and related functions */

DT_FIELD                *Gbl_CurrentField;

/******************************************************************************

 *

 * FUNCTION:    DtResolveIntegerExpression

 *

 * PARAMETERS:  Field               - Field object with Integer expression

 *              ReturnValue         - Where the integer is returned

 *

 * RETURN:      Status, and the resolved 64-bit integer value

 *

 * DESCRIPTION: Resolve an integer expression to a single value. Supports

 *              both integer constants and labels.

 *

 *****************************************************************************/

ACPI_STATUS

DtResolveIntegerExpression (

    DT_FIELD                *Field,

    UINT64                  *ReturnValue)

{

    UINT64                  Result;

    DbgPrint (ASL_DEBUG_OUTPUT, "Full Integer expression: %s\n",

        Field->Value);

    Gbl_CurrentField = Field;

    Result = DtEvaluateExpression (Field->Value);

    *ReturnValue = Result;

    return (AE_OK);

}

/******************************************************************************

 *

 * FUNCTION:    DtDoOperator

 *

 * PARAMETERS:  LeftValue           - First 64-bit operand

 *              Operator            - Parse token for the operator (EXPOP_*)

 *              RightValue          - Second 64-bit operand

 *

 * RETURN:      64-bit result of the requested operation

 *

 * DESCRIPTION: Perform the various 64-bit integer math functions

 *

 *****************************************************************************/

UINT64

DtDoOperator (

    UINT64                  LeftValue,

    UINT32                  Operator,

    UINT64                  RightValue)

{

    UINT64                  Result;

    /* Perform the requested operation */

    switch (Operator)

    {

    case EXPOP_ONES_COMPLIMENT:

        Result = ~RightValue;

        break;

    case EXPOP_LOGICAL_NOT:

        Result = !RightValue;

        break;

    case EXPOP_MULTIPLY:

        Result = LeftValue * RightValue;

        break;

    case EXPOP_DIVIDE:

        if (!RightValue)

        {

            DtError (ASL_ERROR, ASL_MSG_DIVIDE_BY_ZERO,

                Gbl_CurrentField, Gbl_CurrentField->Value);

            return (0);

        }

        Result = LeftValue / RightValue;

        break;

    case EXPOP_MODULO:

        if (!RightValue)

        {

            DtError (ASL_ERROR, ASL_MSG_DIVIDE_BY_ZERO,

                Gbl_CurrentField, Gbl_CurrentField->Value);

            return (0);

        }

        Result = LeftValue % RightValue;

        break;

    case EXPOP_ADD:

        Result = LeftValue + RightValue;

        break;

    case EXPOP_SUBTRACT:

        Result = LeftValue - RightValue;

        break;

    case EXPOP_SHIFT_RIGHT:

        Result = LeftValue >> RightValue;

        break;

    case EXPOP_SHIFT_LEFT:

        Result = LeftValue << RightValue;

        break;

    case EXPOP_LESS:

        Result = LeftValue < RightValue;

        break;

    case EXPOP_GREATER:

        Result = LeftValue > RightValue;

        break;

    case EXPOP_LESS_EQUAL:

        Result = LeftValue <= RightValue;

        break;

    case EXPOP_GREATER_EQUAL:

        Result = LeftValue >= RightValue;

        break;

    case EXPOP_EQUAL:

        Result = LeftValue = RightValue;

        break;

    case EXPOP_NOT_EQUAL:

        Result = LeftValue != RightValue;

        break;

    case EXPOP_AND:

        Result = LeftValue & RightValue;

        break;

    case EXPOP_XOR:

        Result = LeftValue ^ RightValue;

        break;

    case EXPOP_OR:

        Result = LeftValue | RightValue;

        break;

    case EXPOP_LOGICAL_AND:

        Result = LeftValue && RightValue;

        break;

    case EXPOP_LOGICAL_OR:

        Result = LeftValue || RightValue;

        break;

   default:

        /* Unknown operator */

        DtFatal (ASL_MSG_INVALID_EXPRESSION,

            Gbl_CurrentField, Gbl_CurrentField->Value);

        return (0);

    }

    DbgPrint (ASL_DEBUG_OUTPUT,

        "IntegerEval: %s (%8.8X%8.8X %s %8.8X%8.8X) = %8.8X%8.8X\n",

        Gbl_CurrentField->Value,

        ACPI_FORMAT_UINT64 (LeftValue),

        DtGetOpName (Operator),

        ACPI_FORMAT_UINT64 (RightValue),

        ACPI_FORMAT_UINT64 (Result));

    return (Result);

}

/******************************************************************************

 *

 * FUNCTION:    DtResolveLabel

 *

 * PARAMETERS:  LabelString         - Contains the label

 *

 * RETURN:      Table offset associated with the label

 *

 * DESCRIPTION: Lookup a lable and return its value.

 *

 *****************************************************************************/

UINT64

DtResolveLabel (

    char                    *LabelString)

{

    DT_FIELD                *LabelField;

    DbgPrint (ASL_DEBUG_OUTPUT, "Resolve Label: %s\n", LabelString);

    /* Resolve a label reference to an integer (table offset) */

    if (*LabelString != '$')

    {

        return (0);

    }

    LabelField = DtLookupLabel (LabelString);

    if (!LabelField)

    {

        DtError (ASL_ERROR, ASL_MSG_UNKNOWN_LABEL,

            Gbl_CurrentField, LabelString);

        return (0);

    }

    /* All we need from the label is the offset in the table */

    DbgPrint (ASL_DEBUG_OUTPUT, "Resolved Label: 0x%8.8X\n",

        LabelField->TableOffset);

    return (LabelField->TableOffset);

}

/******************************************************************************

 *

 * FUNCTION:    DtDetectAllLabels

 *

 * PARAMETERS:  FieldList           - Field object at start of generic list

 *

 * RETURN:      None

 *

 * DESCRIPTION: Detect all labels in a list of "generic" opcodes (such as

 *              a UEFI table.) and insert them into the global label list.

 *

 *****************************************************************************/

void

DtDetectAllLabels (

    DT_FIELD                *FieldList)

{

    ACPI_DMTABLE_INFO       *Info;

    DT_FIELD                *GenericField;

    UINT32                  TableOffset;

    TableOffset = Gbl_CurrentTableOffset;

    GenericField = FieldList;

    /*

     * Process all "Label:" fields within the parse tree. We need

     * to know the offsets for all labels before we can compile

     * the parse tree in order to handle forward references. Traverse

     * tree and get/set all field lengths of all operators in order to

     * determine the label offsets.

     */

    while (GenericField)

    {

        Info = DtGetGenericTableInfo (GenericField->Name);

        if (Info)

        {

            /* Maintain table offsets */

            GenericField->TableOffset = TableOffset;

            TableOffset += DtGetFieldLength (GenericField, Info);

            /* Insert all labels in the global label list */

            if (Info->Opcode == ACPI_DMT_LABEL)

            {

                DtInsertLabelField (GenericField);

            }

        }

        GenericField = GenericField->Next;

    }

}

/******************************************************************************

 *

 * FUNCTION:    DtInsertLabelField

 *

 * PARAMETERS:  Field               - Field object with Label to be inserted

 *

 * RETURN:      None

 *

 * DESCRIPTION: Insert a label field into the global label list

 *

 *****************************************************************************/

static void

DtInsertLabelField (

    DT_FIELD                *Field)

{

    DbgPrint (ASL_DEBUG_OUTPUT,

        "DtInsertLabelField: Found Label : %s at output table offset %X\n",

        Field->Value, Field->TableOffset);

    Field->NextLabel = Gbl_LabelList;

    Gbl_LabelList = Field;

}

/******************************************************************************

 *

 * FUNCTION:    DtLookupLabel

 *

 * PARAMETERS:  Name                - Label to be resolved

 *

 * RETURN:      Field object associated with the label

 *

 * DESCRIPTION: Lookup a label in the global label list. Used during the

 *              resolution of integer expressions.

 *

 *****************************************************************************/

static DT_FIELD *

DtLookupLabel (

    char                    *Name)

{

    DT_FIELD                *LabelField;

    /* Skip a leading $ */

    if (*Name == '$')

    {

        Name++;

    }

    /* Search global list */

    LabelField = Gbl_LabelList;

    while (LabelField)

    {

        if (!ACPI_STRCMP (Name, LabelField->Value))

        {

            return (LabelField);

        }

        LabelField = LabelField->NextLabel;

    }

    return (NULL);

}